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The legal evolution of crimes against humanity: Scale, system, and the state as criminal enterprise
In Brief
- Crimes Against Humanity (CAH) were codified post-WWII to prosecute systematic, widespread atrocities that fundamentally challenge traditional state sovereignty.
- CAH is defined by its scale and systematic execution, targeting an entire 'civilian population' rather than isolated acts or standard war crimes.
- Governmental participation is a material element of CAH, transforming individual acts into state-sanctioned policy and holding high-level planners accountable.
- The establishment of CAH asserts a universal moral standard, affirming that offenses against human dignity are crimes against all peoples, regardless of local law.
The development of international law has been profoundly shaped by the moral judgments of the civilized world, gradually giving expression to a universal conscience in response to acts of profound inhumanity [1]. A foundational principle emerging from this evolution is that a violation of international law constitutes a crime not merely against the immediate victims, but against all peoples of the world [2]. This concept confronts the traditional deference to state sovereignty, particularly when a state itself becomes the perpetrator of mass violence. The challenge for the international legal order was to create a framework capable of addressing atrocities that were not random or isolated, but systematic, widespread, and often executed through the machinery of government. This required a legal category that could look beyond individual criminal acts to prosecute the architects and participants of state-sponsored terror [3, 4].
The legal innovation designed to meet this challenge was the codification of “Crimes Against Humanity.” This category was established to distinguish systematic abuses from the sporadic violence inherent in armed conflict, thereby providing a basis for prosecuting persecution and extermination directed at civilian populations [5, 6]. While often linked to war crimes, the concept of crimes against humanity is broader, capable of encompassing atrocities committed against a state's own nationals and even before the outbreak of war [7, 8]. Its defining features are not the nature of a single act, but its context as part of a larger system of violence, its immense scale, and its origin in a deliberate state policy or plan [9, 10]. This legal framework represents a crucial step in holding individuals accountable for their role in enterprises that seek to degrade and destroy entire segments of the human population [11].
From the Individual to the Population: The Criterion of Scale
A central pillar of the legal definition of crimes against humanity lies in its specific focus on the collective nature of the victims. The jurisdiction established by post-war tribunals was explicitly limited, designed not to prosecute an isolated crime committed by an individual, but rather acts perpetrated against a civilian population as a whole [12]. This distinction is fundamental, shifting the legal focus from a singular offense against an individual to a systemic attack on a group. The formulation targets actions such as murder, extermination, enslavement, and deportation when they are committed as part of a widespread or systematic policy, rather than as unrelated incidents .
The scale and scope of the atrocities were considered prima facie evidence of their systematic nature. Crimes committed over a vast geographical area, such as those perpetrated by the SS across Germany and occupied territories, were seen as irrefutable proof of a coordinated criminal plan known to its members . The concept of crimes against humanity was thus forged to address this very phenomenon: a merciless state machine subjecting entire populations to agonizing phases of degradation and suffering as a prelude to their extermination . The charge encompasses not just the final act of killing, but the entire process of dehumanization that precedes it [13].
This legal category is understood to be an aggravation of other offenses, such as war crimes or crimes against peace, distinguished by its dimension and systematic execution . The same acts of violence could therefore constitute both war crimes and the separate offense of crimes against humanity, with the latter charge capturing the broader, systematic context of the persecution [14]. The origins of these crimes were traced to the core ideology of the perpetrators, which sought world domination through the enslavement and extermination of peoples, making the concept of crimes against humanity applicable to nearly all of their criminal acts [15].
The State as Criminal Enterprise
Crimes against humanity are intrinsically linked to the involvement of the state or a state-like organization. Governmental participation is considered a material element of the crime, transforming individual acts of violence into a state-sanctioned policy of persecution . Under this framework, responsibility is assigned to those who act directly for the state, as they are the ones in a position to understand and implement the unlawful orders that drive the system of abuse . The prestige of state sovereignty cannot be used as a shield to grant impunity for such actions .
The prosecution of these crimes often focused on the role of the state’s legal and administrative apparatus in facilitating the atrocities. The argument was made that the laws, decrees, and judicial systems of a perverted state were not just tools but constituted the very substance of war crimes and crimes against humanity . Therefore, participation in the enactment and enforcement of such a system amounted to complicity in the crimes themselves. This view reframes state institutions not as instruments of order, but as components of a criminal enterprise.
The legal doctrine of conspiracy was also applied to capture the planned and organized nature of these offenses. Even if one person’s actions did not complete the crime, their connection to a broader plan or enterprise involving its commission was sufficient to establish guilt [16]. Tribunals could therefore convict individuals based on their participation in a scheme to commit crimes against humanity, linking them to the overarching criminal endeavor even without direct involvement in every specific act [17]. This approach was essential for holding high-level planners and organizers accountable for the actions carried out by their subordinates as part of a coordinated system .
Codifying a Universal Morality in International Law
The establishment of crimes against humanity as a distinct legal category was not the creation of a new offense out of thin air, but rather the codification of pre-existing moral and legal principles . International law is understood not as a static set of codes but as a dynamic expression of the moral judgments of the global community . The argument that prosecuting these acts was retroactive was countered by the fact that the perpetrators knew their actions—acts of violence against the persons, property, and human status of civilians—were already considered crimes for which they would have to answer [18]. The new international law simply provided a forum and a name for offenses that threatened the very civilization of the world [19].
This legal development affirmed that there is only one standard of morality, which applies equally to the relations between nations and the relations between individuals [20]. By punishing these crimes, international justice sought to build faith in a system where law is recognized and upheld by the international community . It established that certain acts are so heinous that they are considered violations of common international law, regardless of local statutes, especially when the welfare of the international society is adversely affected [21]. Even the crime of genocide was recognized as an international crime based on the persuasive interpretation of world opinion by authoritative bodies [22].
While the specific definition of an independent crime against humanity was initially seen by some as lacking precise statutory limits [23, 24], its substance was clarified through judicial interpretation. It was defined in relation to war crimes and crimes against peace, characterized by its systematic nature and immense scale . Ultimately, the legal framework for crimes against humanity emerged from the confluence of statute and common international law, creating a powerful tool to prosecute what one prosecutor termed a "crime against the spirit": a doctrine denying all moral values in order to plunge humanity back into a calculated, diabolical barbarism [25].
The legal concept of “Crimes Against Humanity” marked a watershed moment in international jurisprudence. It provided the necessary framework to prosecute systematic, state-directed violence that transcends isolated criminal acts . By focusing on the collective victim—the civilian population—and identifying the crucial role of a state-level plan or policy, this category of crime addresses the unique horror of mass atrocities . It pierces the veil of national sovereignty to hold individuals accountable for their participation in a criminal enterprise, affirming that those who act for the state are not immune from justice . The crime is defined not just by the act, but by the system that produces it and the immense scale of its devastation.
Ultimately, the prosecution of crimes against humanity is an assertion of a universal moral standard, codified into the law of nations . It declares that certain offenses against human dignity are a crime against all peoples and that the international community has both the right and the duty to demand justice . By holding perpetrators accountable for attacking the very
